Many-body quantum dynamics and induced correlations of Bose polarons
Abstract
We study the ground state properties and nonequilibrium dynamics of two spinor bosonic impurities immersed in a one-dimensional bosonic gas upon applying an interspecies interaction quench. For the ground state of two non-interacting impurities we reveal signatures of attractive induced interactions in both cases of attractive or repulsive interspecies interactions, while a weak impurity-impurity repulsion forces the impurities to stay apart. Turning to the quench dynamics we inspect the time-evolution of the contrast unveiling the existence, dynamical deformation and the orthogonality catastrophe of Bose polarons. We find that for an increasing postquench repulsion the impurities reside in a superposition of two distinct two-body configurations while at strong repulsions their corresponding two-body correlation patterns show a spatially delocalized behavior evincing the involvement of higher excited states. For attractive interspecies couplings, the impurities exhibit a tendency to localize at the origin and remarkably for strong attractions they experience a mutual attraction on the two-body level that is imprinted as a density hump on the bosonic bath.
Keywords
Cite
@article{arxiv.1911.02011,
title = {Many-body quantum dynamics and induced correlations of Bose polarons},
author = {S. I. Mistakidis and G. M. Koutentakis and G. C. Katsimiga and Th. Busch and P. Schmelcher},
journal= {arXiv preprint arXiv:1911.02011},
year = {2020}
}
Comments
25 pages, 12 figures